US4606677A - Device for introducing dosed quantities of pulverized solid materials into a carrier gas stream - Google Patents

Device for introducing dosed quantities of pulverized solid materials into a carrier gas stream Download PDF

Info

Publication number
US4606677A
US4606677A US06/550,565 US55056583A US4606677A US 4606677 A US4606677 A US 4606677A US 55056583 A US55056583 A US 55056583A US 4606677 A US4606677 A US 4606677A
Authority
US
United States
Prior art keywords
dosing device
housing
sleeve
sleeve means
carrier gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/550,565
Other languages
English (en)
Inventor
Edouard Legille
Leon Ulveling
Pierre Mailliet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from LU84462A external-priority patent/LU84462A1/fr
Priority claimed from LU84812A external-priority patent/LU84812A7/fr
Application filed by Paul Wurth SA filed Critical Paul Wurth SA
Assigned to PAUL WURTH S.A. reassignment PAUL WURTH S.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MAILLIET, PIERRE, ULVELING, LEON, LEGILLE, EDOUARD
Application granted granted Critical
Publication of US4606677A publication Critical patent/US4606677A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
    • G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
    • G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
    • G01F11/24—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for fluent solid material

Definitions

  • the present invention relates to an apparatus for introducing measured or dosed quantities of pulverized or pulverulent materials into a carrier gas stream.
  • This invention is particularly applicable to the operation of injecting solid fuels into a shaft furnace during a metal refining process.
  • European Patent Application No. 0043606 describes a pneumatic transport device for pulverulent materials, particularly coal and/or lignite dust.
  • a pneumatic current or carrier gas stream is formed by the introduction or entrainment of pulverized particles (i.e., coal dust) into a current of pressurized air, whereby the finely dispersed particles are propelled therethrough.
  • the well know prior art method for effecting this carrier gas stream involves a honeycomb-type rotor having plural chamber means.
  • a typical prior art pneumatic transport device comprises, then, a cylindrical rotor peripherally provided with plural vanes which define individual and corresponding compartments or cells.
  • This rotor will rotate within a housing about its longitudinal axis in a hermetic fashion, so that the pulverized material fed in from the top is conveyed downwardly via the compartments or cells into a current of compressed air, the compressed air serving as a propulsion fluid or carrier gas.
  • This carrier gas thus carries or entrains the pulverized material subsequent to delivery by the compartment or cells.
  • This well known type of dosing apparatus has certain serious deficiencies and problems.
  • One such problem involves the leakage of very fine particles of the pulverulent material from the cells or chambers into and along both the rotor shaft and rotor bearings.
  • these extremely fine particles easily migrate into virtually every area of the dosing mechanism including the small circular interstice located between the rotor shaft and the internal surface of the bearing. Although very small, this interstice is necessary in order to avoid undesirable friction.
  • a novel device for the introduction of measured or dosed quantities of pulverized solid materials into a pneumatic propulsion fluid or carrier gas which prevents the aforementioned undesirable leakage.
  • the present invention comprises a preferably cylindrical housing partially traversed in the axial direction by a pressurized fluid or carrier gas.
  • the housing also has a side or radial aperture or opening which communicates with a tank containing pulverized solid material. The pressure in the tank should be above that of the carrier gas.
  • the housing further contains two coaxial sleeves defined as an inner sleeve and an outer sleeve.
  • the inner sleeve has an axial bore which provides passage therethrough to the carrier gas. At least one of the two sleeves is capable of rotating about its longitudinal axis and is connected for this purpose to a suitable device for imparting rotation.
  • Each of the sleeves is further provided with a slot positioned so as to correspond with each other and with the side or radial aperture on the housing.
  • the slots are permitted to meet and overlap each other as the rotatable sleeve rotates about its axis.
  • the slots in both sleeves are respectively identical in shape and thereby complimentary.
  • the respective overlapping and identical slots on the inner and outer sleeves thus define a passage of varying size (depending on the position of the rotating sleeve). This passage allows pulverized material in the tank to pass through the carrier gas stream which flows through the inner sleeve.
  • the inner sleeve is movable (rotatable) and the outer sleeve is integral or attached to the housing while in a second embodiment, the inner sleeve is fixed and the outer sleeve is movable.
  • This second embodiment offers an advantage over the first embodiment by reducing the risk of forming a build-up or "bridge" as discussed and defined in more detail hereinafter.
  • the length of the two sleeves are approximately equal to the diameter of the side aperture of the housing.
  • An annular friction ring is provided between the housing and the annular front surface of the movable sleeve.
  • the movable sleeve is subjected to axial force provided by a spring means which acts to keep the sleeve in contact with the ring.
  • the spring should be provided with adjustable tensioning means.
  • the outer diameter of the outer sleeve is preferably less than the internal diameter of the cylindrical housing in order to define an annular space between the outer sleeve and the housing and to reduce the risk of seizing.
  • FIG. 1 is a cross sectional elevation view of a first embodiment of a dosing device in accordance with the present invention.
  • FIG. 2 is a cross sectional elevation view of a second embodiment of a dosing device in accordance with the present invention.
  • FIG. 3a is a cross sectional elevation view of the dosing device of FIGS. 1 and 2, showing two sleeves in an open position.
  • FIG. 3b is a cross sectional elevation view of the dosing device of FIG. 3a showing the two sleeves in a partially open position.
  • FIG. 3c is a cross sectional elevation view of the dosing device of FIG. 3a showing the two sleeves in a partially closed position.
  • FIG. 3d is a cross sectional elevation view of the dosing device of FIG. 3a showing the two sleeves in a closed position.
  • FIGS. 4a, 4b and 4c are schematic views of cooperating slots in different positions having a first configuration.
  • FIGS. 5a, 5b and 5c are schematic views of cooperating slots in different positions having a second configuration.
  • FIGS. 6a, 6b and 6c are schematic views of cooperating slots in different positions having a third configuration.
  • FIGS. 7a, 7b and 7c are schematic views of cooperating slots in different postions having a fourth configuration.
  • FIG. 8 is a cross sectional elevation view of a third embodiment of a dosing device in accordance with the present invention.
  • FIG. 9 is a cross sectional view along the line 9--9 in FIG. 8 and in accordance with the present invention.
  • the dosing device consists of a cylindrical housing 10 which is enclosed at either end via securing flange 12 and a front plate 14.
  • the housing 10 contains therein, two coaxial cylindrical sleeves 16 and 18 defined as an inner sleeve 16 and an outer sleeve 18.
  • the outer sleeve 18 is fixed in position and integral with the front plate 14 while the inner sleeve 16 can freely rotate about the longtitudinal axis O.
  • Running longitudinally along the inside center of inner sleeve 16 is axial bore 20 which communicates with a pneumatic transport pipe or carrier gas pipe 22.
  • the housing 10 also has two lateral pipes 24 and 26, the pipe 24 communicating with a tank containing pulverized solid materials and the pipe 26 being connected to a source of compressed air which acts to convey the pulverized materials through the pipe 22.
  • the pipe 26 is in direct communication via annular chamber 28 with the axial bore 20 of the inner sleeve 16.
  • the two sleeves 16 and 18 are each provided with lateral or radial slots 30 and 32 respectively. These slots are positioned at a place corresponding to the point where the pulverized material exits from pipe 24. Thus, these slots define a passage between the pipe 24 and the axial bore 20 having a size which will be variable according to the angular position occupied by the movable or rotatable sleeve 16.
  • FIGS. 3a through 3d are cross sections through the slots 30 and 32 which show different angular positions for the inner movable sleeve 16.
  • the sleeve 16 has been positioned such that the slots 30 and 32 are in full alignment thereby defining a passage between the pipe 24 and bore 20 of maximum obtainable width.
  • a rotation of the sleeve 16 will gradually reduce the cross section of the opening or passage between the pipe 24 and the axial bore 20.
  • this passage narrows to a minimum width.
  • the device completely closes.
  • a drive shaft 34 is provided at the end opposite the discharge pipe 22.
  • the shaft 34 is mounted in the housing 10 with the aid of a sealing ring 38, leakage of compressed air thus being prevented therefrom.
  • This drive shaft 34 is made connected for rotation with the movable sleeve 16 by means, for example, of two diametrically opposed grips 40 which engage corresponding grooves in the front of the sleeve 16.
  • the drive shaft 34 is connected by a sleeve member 42 to a stepping motor (not shown).
  • One prototype of the present invention has utilized a motor which applied an electrical impulse to produce a rotation of 0.36° at a speed of 1-2 rpm.
  • the compressed air or carrier gas coming from the pipe 26 passes through the annular chamber 28, and into and through the internal axial bore 20 towards the pneumatic pipe 22.
  • the compressed gas carries along with it the pulverized material (i.e., coal dust) introduced via the calibrated aperture defined by the interaction of the slots 30 and 32.
  • the material is delivered through the slots, in part, because of a difference between the higher pressure in the tank containing the pulverized solids (not shown in the drawing) and the lower pressure of the air in the bore 20.
  • the major novel improvement achieved by the dosing device of the present invention essentially consists of the limited number of moving parts.
  • the change in the rate of delivery of pulverized material was brought about by altering the rotation speed of the chamber.
  • the output of pulverized material of the present invention in the device can be adjusted simply by modifying the angular position occupied by the movable sleeve. It should be noted in fact, that as long as the rate of delivery is constant there is no component in motion at all; since the movable sleeve remains stationary, whereas the prior art device required constant rotation of the honeycomb-type chamber.
  • the inner sleeve 16' is fixed in position and integral with the front plate 14, while the inner socket 18' is movable and connected for this purpose to the driving shaft 34 in the same manner as in the embodiment shown in FIG. 1.
  • the two slots 30' and 32' provided in the sockets 16' and 18' again define the cross section of the passage through which the pulverized material may flow.
  • the device as shown in FIG. 2 does in fact offer a certain advantage over the structure of the first embodiment owing to the fact tht outer sleeve 18' is movable as opposed to the inner sleeve 16. It appears that the pulverized material which is supplied under pressure through pipe 24 tends to form a build-up or "bridge" around the slot 32 or 32' of the sleeve 18 or 18'. This "bridge” will obviously decrease the amount of material passing down through to the carrier gas. In the second embodiment where the sleeve 18' is the movable element, there is a far lesser risk of creating such an undesirable "bridge".
  • FIGS. 4, 5, 6 and 7, slots of different shapes and in various positions are shown in plan view as seen looking down through the aperture 24.
  • the slots are shaped as elongated ovals 30 and 32 which, in the position illustrated in FIG. 4a, only overlap to a very small extent, thus defining a flow passage of circular cross section, the width of the passage for the material thus being at its minimum.
  • a rotation of the movable socket 30 or 32 will increase the cross section of the aperture, as shown in FIG. 4b, with the cross section of the flow passage reaching its maximum size in the position shown in FIG. 4c wherein the two slots 30 and 32 are in full alignment.
  • FIGS. 5, 6 and 7 the positions shown in FIGS. 4a, 4b and 4c respectively are retained, but now the slots have alternative shapes.
  • the set of slots in FIGS. 5a to 5c are wider (more rectangular) than the set of slots in FIGS. 4a to 4c and allow a greater delivery rate of pulverized material.
  • FIGS. 6 and 7 are specially characterized by the fact that the adjustment of the cross section of the aperture is effected both in the direction of its length and in the direction of its width. This offers the advantage that the cross section is more quickly modified. Also, another advantage is that the movable socket need not perform as great a rotation for a given modification. The modification in the width of the cross section may also help to reduce the risk of the formation of a "bridge" as described earlier. As shown in FIGS. 6a-6c, the slots have an arrow shape while FIGS. 7a-7c disclose slots having a triangular shape.
  • the interior of the housing 10 contains two dosing sleeves 44 and 46 having a similar structure to the dosing sleeves described earlier.
  • the sleeve 44 is fixed in position and integral with the housing 10, while the sleeve 46 is movable or rotatable about the longitudinal axis O.
  • Sleeve 46 is fixed to and forms the front portion of a rotatable cylindrical body 48 capable of sliding longitudinally in a longitudinal bore provided in the housing 10.
  • the compressed air is supplied from conduit 26 and via both an annular chamber 50 located in the body 48 and the hollow central part of the chamber, to a mixing chamber 52 inside the inner sleeve 44.
  • the mixing chamber 52 extends along the longitudinal axis of the housing 10 towards a pneumatic transport pipe (not shown). It should be understood that alternatively, the sleeve 44 may be movable while the sleeve 46 is fixed, as in the embodiment of FIG. 2.
  • the two sleeves 44 and 46 are provided with dosing slots 54, 56 (see also FIG. 9) respectively.
  • the dosing slots 54, 56 are actuated (i.e., relatively adjusted to form passages of varying size) by the rotation of the movable sleeve about the axis O as already described in detail with reference to the preceding figures.
  • the pulverized material as shown in the left-hand portion of the diagrams, might find its way in between the movable sleeve and the inner surface of the housing and between the inner surface of the movable sleeve and the outer surface of the fixed sleeve. If the powdered material was allowed in those areas, the risk of seizing would increase.
  • the pulverized material can only penetrate, at the most, the surface area between the two sleeves. Because that surface area is very limited in size and despite the presence of a small gap or clearance therebetween, the risk of seizing is greatly reduced. Note that the gap or clearance between the two sleeves presents no problem (i.e., hermeticity is ensured) due to a friction ring 58, which may be made, for example, of an alloy of teflon and bronze, and which in the FIG. 8 embodiment is positioned around the fixed sleeve 44 between the housing 10 and the end of the movable sleeve 46. This movable sleeve 46 is held against the ring 58 by the action of a spring 60.
  • a friction ring 58 which may be made, for example, of an alloy of teflon and bronze
  • the outer diameter of the outer sleeve 46 is less than the internal diameter of a part of the housing 10.
  • an annular chamber 45 is defined between the outer sleeve and the housing which further reduces the risk of seizing by allowing the pulverized material a circulating path.
  • the function of elastically holding the sleeve 46 against the ring 58 is performed by a spring 60, e.g., of the Belleville type, gripped between the body 48 and a jacket 62.
  • This jacket 62 is fixed in the axial direction but is nonetheless able to rotate about the axis O. This rotation is provided by mounting the jacket 62 in ball bearings 64 and sealing rings 66, 76.
  • the action of the spring 60 is therefore exerted on the body 48 and the sleeve 46, in the direction of the friction ring 58.
  • the longitudinal movement of the body 48 is rendered independent of the jacket 62 and the angular movements between these components are rendered dependent by any known means, e.g., a pin 68 such as shown in the diagram.
  • the rotation of the jacket 62 may be effected by means of a handle 70, whereby the rotation of the movable sleeve 46 and the masking of the slots 54 and 56 will vary by a greater or smaller extent, as explained with reference to the preceeding FIGURES.
  • the pressure of the spring 60 is adjustable, e.g., by means of a regulating rod 72 and a securing nut 74.
  • the aperture 24 may have an oval shape instead of a circular shape.
  • the compressed air should preferably be admitted via channels or interstices 78 in the chamber containing the spring 60.
  • the present invention provides an improved and novel device for injecting solid fuels (i.e., carbonaceous materials) into a shaft furnace.
  • solid fuels i.e., carbonaceous materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Fluid Mechanics (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Nozzles (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
US06/550,565 1982-11-10 1983-11-10 Device for introducing dosed quantities of pulverized solid materials into a carrier gas stream Expired - Fee Related US4606677A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
LU84462 1982-11-10
LU84462A LU84462A1 (fr) 1982-11-10 1982-11-10 Dispositif d'introduction de quantites dosees de matieres pulverulentes dans un fluide de propulsion pneumatique et application a l'injection de combustibles solides dans un four a cuve
LU84812A LU84812A7 (fr) 1983-05-19 1983-05-19 Dispositif d'introduction de quantites dosees de matieres pulverulentes dans un fluide de propulsion pneumatique et application a l'injection de combustibles solides dans un four a cuve
LU84812 1983-05-19

Publications (1)

Publication Number Publication Date
US4606677A true US4606677A (en) 1986-08-19

Family

ID=26640293

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/550,565 Expired - Fee Related US4606677A (en) 1982-11-10 1983-11-10 Device for introducing dosed quantities of pulverized solid materials into a carrier gas stream

Country Status (9)

Country Link
US (1) US4606677A (fr)
EP (1) EP0108319B1 (fr)
AR (1) AR230884A1 (fr)
AU (1) AU557972B2 (fr)
BR (1) BR8306315A (fr)
CA (1) CA1225418A (fr)
DE (1) DE3375698D1 (fr)
ES (1) ES526192A0 (fr)
PL (1) PL137025B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211751A (en) * 1992-02-28 1993-05-18 W.R. Grace & Co.-Conn. Hydraulic cement set-accelerating admixtures incorporating amino acid derivatives

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU84780A1 (fr) * 1983-04-28 1984-11-28 Wurth Paul Sa Dispositif d'introduction de quantites dosees de matieres pulverulentes dans un fluide de propulsion pneumatique et application a un reservoir de distribution de matieres pulverulentes
LU85299A1 (fr) * 1984-04-11 1985-11-27 Wurth Paul Sa Dispositif d'introduction de quantites dosees de matieres pulverulentes dans un fluide de propulsion pneumatique
LU85298A1 (fr) * 1984-04-11 1985-11-27 Wurth Paul Sa Dispositif d'introduction de quantites dosees de matieres pulverulentes dans un fluide de propulsion pneumatique
DE3436624A1 (de) * 1984-10-05 1986-04-10 Norddeutsche Affinerie AG, 2000 Hamburg Vorrichtung zur erzeugung zuendfaehiger feststoff/gas-suspensionen
DE3507973A1 (de) * 1985-03-06 1986-09-18 Klöckner CRA Technologie GmbH, 4100 Duisburg Dosierschieber fuer feinkoernige feststoffe
LU86311A1 (fr) * 1986-02-19
LU86870A1 (fr) * 1987-05-07 1989-01-19 Wurth Paul Sa Dispositif de modification de la section d'une conduite de transport pneumatique et application a l'injection de combustibles solides dans un four a cuve
CN105712084A (zh) * 2016-02-01 2016-06-29 北京理工大学 一种气体压力驱动式均匀供粉装置和方法
CN111809033A (zh) * 2020-07-22 2020-10-23 赣州市合安科技有限公司 一种进出料方便的井式回火炉

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731302A (en) * 1953-05-11 1956-01-17 Upham Charles Roland Air switch and ported control head for powdered iron dispenser
US3006512A (en) * 1958-07-16 1961-10-31 Keathley Material dispensing machine
US3527503A (en) * 1968-08-05 1970-09-08 Pullman Inc Pneumatic outlet assembly for hoppers
SU371147A1 (ru) * 1970-06-16 1973-02-22 Н. И. Чебыкин, А. Н. Стриганов , И. Б. Левицкий Производственно техническое объединение Уралэнергоцветмет Питатель всасывающей пневмотранспортной
US3840158A (en) * 1972-10-17 1974-10-08 Nordson Corp Modular applicator system
GB1493525A (en) * 1976-04-13 1977-11-30 Lister & Co Ltd R Agricultural broadcaster

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1094112A (en) * 1964-10-14 1967-12-06 Tills Engineering Co Ltd Transporting and dispensing installation for granular and pulverulent material
DE2552594B2 (de) * 1975-11-24 1977-09-22 Ingenieurgesellschaft Industriebau mbH, 2000 Hamburg Vorrichtung zum dosieren und absperren von staubfoermigen und rieselfaehigen schuettguetern
JPS5942045B2 (ja) * 1980-05-22 1984-10-12 ドネツキイ ナウチノ−イスレドバテルスキイ インステイチユ−トチエルノイ メタルルギイ 微粉砕石炭を高炉炉床に供給するための通気供給器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731302A (en) * 1953-05-11 1956-01-17 Upham Charles Roland Air switch and ported control head for powdered iron dispenser
US3006512A (en) * 1958-07-16 1961-10-31 Keathley Material dispensing machine
US3527503A (en) * 1968-08-05 1970-09-08 Pullman Inc Pneumatic outlet assembly for hoppers
SU371147A1 (ru) * 1970-06-16 1973-02-22 Н. И. Чебыкин, А. Н. Стриганов , И. Б. Левицкий Производственно техническое объединение Уралэнергоцветмет Питатель всасывающей пневмотранспортной
US3840158A (en) * 1972-10-17 1974-10-08 Nordson Corp Modular applicator system
GB1493525A (en) * 1976-04-13 1977-11-30 Lister & Co Ltd R Agricultural broadcaster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211751A (en) * 1992-02-28 1993-05-18 W.R. Grace & Co.-Conn. Hydraulic cement set-accelerating admixtures incorporating amino acid derivatives

Also Published As

Publication number Publication date
AR230884A1 (es) 1984-07-31
AU557972B2 (en) 1987-01-15
ES8406696A1 (es) 1984-08-16
AU1966183A (en) 1984-05-17
CA1225418A (fr) 1987-08-11
EP0108319A2 (fr) 1984-05-16
DE3375698D1 (en) 1988-03-24
EP0108319B1 (fr) 1988-02-17
PL137025B1 (en) 1986-04-30
ES526192A0 (es) 1984-08-16
PL244498A1 (en) 1984-07-16
BR8306315A (pt) 1984-06-19
EP0108319A3 (en) 1985-11-21

Similar Documents

Publication Publication Date Title
US4606677A (en) Device for introducing dosed quantities of pulverized solid materials into a carrier gas stream
US4463921A (en) Gas jet steering device and method missile comprising such a device
US12467538B2 (en) Sliding component
US4257617A (en) Shaft seal assembly
FI72584C (fi) Ventil.
EP0870546A3 (fr) Appareil de pulvérisation de poudre à distributeur rotatif
GB1399444A (en) Centrifugal separating apparatus
GB2040023A (en) Changeover valve
US6059148A (en) Metering device
US4153192A (en) Control member for fastening element setting device
US3278092A (en) Apparatus for the regulated discharge of materials under pressure
JP2544797B2 (ja) パッキン
WO1988003224A1 (fr) Agencement dans un mecanisme a injection
US3104020A (en) Apparatus for gasification of finely divided solid fuels
US4934604A (en) Controllable outlet nozzle for pneumatic dosaging conveyors
US5405062A (en) Rotary product supply and discharge distributors
US3950045A (en) Jet and spray producing apparatus
US1402184A (en) Feeding apparatus for pulverized material
DE3560343D1 (en) Injection arrangement of dosed quantities of pulverulent materials in a pneumatic propulsion fluid
JPS60228325A (ja) 所定量の粉体材料を空気輸送用流体中に導入する装置
JPS59173211A (ja) 調合量粉末状物質を空気力推進流体中へ導入する装置とそれの高炉内へ固体燃料投入への使用
US6305884B1 (en) Rotary powder feed through apparatus
FR2527716A1 (fr) Unite de roulement pour la vis sans fin d'une centrifugeuse
KR20190022413A (ko) 특히, 코팅 디바이스의 구성요소로서 분말을 이송하기 위한 디바이스 및 방법
BR8402011A (pt) Dispositivo de introducao de quantidades dosadas de materias pulverulentas em um fluido de propulsao pneumatica e reservatorio de distribuicao de materias pulverulentas

Legal Events

Date Code Title Description
AS Assignment

Owner name: PAUL WURTH S.A., 32, RUED ALSACE, LUXEMBOURG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:LEGILLE, EDOUARD;ULVELING, LEON;MAILLIET, PIERRE;REEL/FRAME:004342/0532;SIGNING DATES FROM 19841022 TO 19841023

FEPP Fee payment procedure

Free format text: PAYMENT IS IN EXCESS OF AMOUNT REQUIRED. REFUND SCHEDULED (ORIGINAL EVENT CODE: F169); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REFU Refund

Free format text: REFUND - PAYMENT OF MAINTENANCE FEE, 4TH YEAR, PL 97-247 (ORIGINAL EVENT CODE: R173); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

DP Notification of acceptance of delayed payment of maintenance fee
REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19980819

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362